EPA Method 552.1 - Surrogate Standard Back Catalog number: 31056 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 2690.34-5UG 17ß(H),21 alpha(H)-(22S)-Tetrakishomohopane , neat, Solvent-neat, Unit ca. 5µg, # of units-1, Cas.no. 79897-70-4 Price on request VHG-S20MIN-1500-1 Sulfur, 1500µg/g in 20 cSt Mineral Oil, 100ml Price on request 57750 Tin (Sn) Price on request